Tidal resonance
In oceanography , the phenomenon is tidal resonance best by Tidebewegung in the Bay of Fundy explained.
The bay is significantly less deep than the ocean . The difference in depth means a shelf edge at the entrance and makes the bay a half-open resonator . The length of the bay (about 220 km) is just a quarter of the wavelength of the tidal wave inside the bay. The bay is therefore a quarter resonator, so that the incoming and the returning wave have the same amplitude . In addition, the duration of the tidal wave between entry and return from the bay (around 12 hours) is the same as the time interval between two successive high water levelsat the bay entrance. Thus, the returning tidal wave is superimposed with the new wave coming from the ocean. There is a resonance : the water level deflections in the bay are amplified in the rhythm of the tide. Because of this and because of the reduction in wave speed caused by the decreasing water depth in the bay, the tidal range in the interior of Fundy Bay can increase up to 16 m at spring tide ; during a storm surge even 21 m were measured.